US5948130A - Method and apparatus for making large-scale precision structures in flat glass - Google Patents

Method and apparatus for making large-scale precision structures in flat glass Download PDF

Info

Publication number
US5948130A
US5948130A US09/048,624 US4862498A US5948130A US 5948130 A US5948130 A US 5948130A US 4862498 A US4862498 A US 4862498A US 5948130 A US5948130 A US 5948130A
Authority
US
United States
Prior art keywords
paste
tool
flat glass
forming
structuring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US09/048,624
Other languages
English (en)
Inventor
Heinrich Ostendarp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schott AG
Original Assignee
Schott Glaswerke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schott Glaswerke AG filed Critical Schott Glaswerke AG
Application granted granted Critical
Publication of US5948130A publication Critical patent/US5948130A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/241—Manufacture or joining of vessels, leading-in conductors or bases the vessel being for a flat panel display
    • H01J9/242—Spacers between faceplate and backplate
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/02—Re-forming glass sheets
    • C03B23/023—Re-forming glass sheets by bending
    • C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds
    • C03B23/0307—Press-bending involving applying local or additional heating, cooling or insulating means
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/02—Re-forming glass sheets
    • C03B23/023—Re-forming glass sheets by bending
    • C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds
    • C03B23/0305—Press-bending accelerated by applying mechanical forces, e.g. inertia, weights or local forces
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/02—Surface treatment of glass, not in the form of fibres or filaments, by coating with glass
    • C03C17/04—Surface treatment of glass, not in the form of fibres or filaments, by coating with glass by fritting glass powder
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/08—Severing cooled glass by fusing, i.e. by melting through the glass
    • C03B33/082—Severing cooled glass by fusing, i.e. by melting through the glass using a focussed radiation beam, e.g. laser
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/09—Severing cooled glass by thermal shock
    • C03B33/091—Severing cooled glass by thermal shock using at least one focussed radiation beam, e.g. laser beam
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2211/00—Plasma display panels with alternate current induction of the discharge, e.g. AC-PDPs
    • H01J2211/20—Constructional details
    • H01J2211/34—Vessels, containers or parts thereof, e.g. substrates
    • H01J2211/36—Spacers, barriers, ribs, partitions or the like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

Definitions

  • the present invention relates to a method of making large-scale or large-surface area precision structures in or on flat glass and also to an apparatus for performing that process.
  • This type of glass includes, for example display panels of new generation flat display screen devices (Plasma Display Panels (PDP), Plasma Addressed Liquid Crystal (PALC)).
  • PDP Planar Display Panels
  • PLC Plasma Addressed Liquid Crystal
  • Micro-channel structures for control of individual lines or columns, which extend over the entire active display screen width or height and in which a plasma is ignited by electric discharge, are provided in this flat display screen glass.
  • the boundary of each individual channel on both sides of it is provided by a rectangular crosspiece whose width is as small as possible (i.e. ⁇ 100 ⁇ m).
  • the height of the crosspiece is substantially larger than its width.
  • the spacing of the crosspieces should be as small as possible.
  • the height of the crosspieces amounts to from about 150 ⁇ m to 250 ⁇ m at a width of from 50 ⁇ m to 100 ⁇ m.
  • Two electrodes for plasma ignition extend through each individual channel bounded by the crosspieces in plasma addressed liquid crystal (PALC), while one electrode for plasma ignition extends through each individual channel bounded by the crosspieces in plasma display panels (PDP).
  • PLC plasma addressed liquid crystal
  • PDP plasma display panels
  • this flat display screen glass which for example is a 25"-PALC screen of a size of 360 mm ⁇ 650 mm
  • the exact lateral dimensioning, relative positioning and reproducibility of the channel and thus the stability of the forming tool are crucial because of the later positioning of the electrodes.
  • the thermal expansion coefficient amounts to about 12 ⁇ 10 -6 /K.
  • this always causes a length change of about 4 ⁇ m per K temperature fluctuation.
  • the required positioning accuracy of the electrodes in the micro-channels is in the range of ⁇ 10 ⁇ m, a temperature fluctuation of ⁇ 2.5 K can cause considerable problems.
  • the permissible temperature fluctuations are considerably reduced in the larger display screens, for example 42" display screens.
  • a higher tool wear which requires a replacement of the forming tool, occurs during the making of structured glass with reduced structure radii.
  • the method for making large-scale precision structures on or in flat glass comprises the steps of:
  • the apparatus for performing the method according to the invention comprises
  • a method with a suitable apparatus for making a large-scale precision structures in flat glass is described in European Patent Application EP 0 802 170 A3, in which a paste-like material forming the structures is supplied cold to a structuring surface of a forming tool and then the forming tool is pressed on the flat glass during hardening.
  • the principle according to the invention however relates to a hot shaping or forming, in contrast to the above-described EP application which describes a practical cold press process. It is understood that in the hot melted-on grid or pattern applied to the flat glass the bond with the flat glass is substantially more intimate and more stable than in the case of a simple "bake-on", i.e. hardening and sintering of the grid or pattern in the case of the EP application, in which an adhesive layer is still required. Of course in the EP application radiant heat is used but only for making the applied materials flow, not however for heating of the shaping work tool in order to cause melting of the paste applied to the flat glass.
  • laser radiation is used for local heating of the structuring surface of the structure forming tool.
  • This sort of arrangement has the advantage of a very desirable uniform heat up of the structuring surface of the tool, which alternatively is obtainable by an inductive or electrical resistance heating device.
  • the heating can be assisted by another suitable conventional heat source, for example a flame strip device, in order to avoid use of expensive radiation-transparent heavy duty glasses with very high powers.
  • a flame strip device for example a flame strip device
  • the forming tool may be internally cooled in preferred embodiments of the invention.
  • the forming tool with the paste-like material applied can be continuously rolled over the glass surface to be structured.
  • the structures are formed advantageously with a two-part forming tool comprising a base tool and a forming medium releasably attached to it having the structuring surface for the paste-like material. After a certain amount of wear only the forming medium is replaced which is comparatively easy and economical.
  • the base tool is made from a material with comparatively smaller thermal conductivity and the forming medium is made from a material with comparatively larger thermal conductivity which provides an outstanding local heating to a predetermined surface depth.
  • the forming medium filled with the paste in cavities or recesses during the rolling off of the forming medium from the base tool is pressed on the glass so that the paste contacts the glass and is left there during hardening of the applied paste. Because of the reduced heat capacity of the forming medium a substantially more rapid cooling of the applied structures occurs, which advantageously provides a precise and rapid formation of these structures.
  • the paste-like material can be a glass solder, i.e. a material which is already a paste in its initial state. This paste is rolled on or applied with a doctor blade to the structuring surface of the tool analogous to rotogravure, and subsequently bonded and hardened with the glass during contact of the tool with the glass.
  • the paste-like material can be an electrically conductive paste, which is rolled on the structuring surface of the forming tool or applied with a doctor blade and hardened after contacting the surface of the flat glass.
  • FIG. 1 is a main diagrammatic plan view of an apparatus according to the invention for heating a structuring surface of a forming tool by means of a laser which has a medium (glass) transparent for the laser radiation;
  • FIG. 2 is a detailed diagrammatic cross-sectional view of a two-part forming tool having a base tool and a forming medium
  • FIG. 3 is a diagrammatic cross-sectional view through a two-part forming tool according to FIG. 2 with a roller as base tool and a structuring sheet wrapped around the roller as forming medium, and with a doctor blade for application of the structuring paste to the forming medium,
  • FIG. 4 is a diagrammatic cross-sectional view through a two-part forming tool according to FIG. 3, however with a second even or smooth-surfaced roller for application of the paste to the forming medium,
  • FIG. 5 is a diagrammatic cross-sectional view through a two-part forming tool according to FIG. 3, with a doctor blade for application of a melted flat glass, here in the form of a micro-sheet, as a paste in the forming medium,
  • FIG. 6 is a diagrammatic cross-sectional view through a two-part forming tool according to FIG. 3, however with an even-surfaced roller for application of a melted flat glass, here in the form of a micro-sheet, as paste in the forming medium,
  • FIG. 7 is a cross-sectional view through a two-part roller forming tool according to FIG. 3, for bringing a paste in the forming medium by means of a forward wave in front of the roller tool,
  • FIG. 8 is a cross-sectional view through a two-part roller forming tool according to FIG. 3 during application of melted flat glass, here in the form of a micro-sheet, to the forming medium by means of a forward wave in front of the roller tool,
  • FIG. 9 is a diagrammatic cross-sectional view through a two-part forming tool according to FIG. 3, in which the forming medium in the form of a structuring sheet with paste in its structures is rolled off the base roller during the rolling of the base roller, pressed on the glass and adheres to the glass during the hardening stage;
  • FIG. 10 is a perspective view of a two-part forming tool with a base roller having a strip of material wound around it many times in a coil-like manner as the forming medium, which is unrolled during application to the flat glass instead of a sheet;
  • FIG. 11 is a perspective view of a forming tool comprising two axially parallel rollers, of which one is the base roller, with a strip of material as forming medium which is unwound many times;
  • FIG. 11A is a diagrammatic side view of an additional device for the embodiment according to FIG. 11 with the strip of material around a tensioning roller for the purpose of tensioning the strip of material, during thermal stretching of the strip of material;
  • FIG. 12 is a perspective view of a device according to FIGS. 11 and/or 11A for laser radiative heating comprising a laser diode array under the flat glass;
  • FIG. 13 is a perspective view of a device according to FIGS. 11 and/or 11A for laser radiative heating comprising a laser diode array next to and above the base roller.
  • FIG. 1 shows an apparatus for a process for forming large-scale precision structures--here in the form of ducts that are separated by crosspieces--in a flat glass or glass plate 3, which in the present embodiment is a flat glass with micro-channel structures for a flat display screen.
  • the apparatus provides a forming tool 1 with a structuring surface 2, in which a paste-like material 2a forming the structures is supplied, and, which is pressed by means of a force F on the upper side of a heated flat glass 3, in order to impress or apply the described precision structures there.
  • the apparatus has counter-force taking members 4, in order to balance the applied force F relative to the flat glass 3.
  • material 2a forming the structures can be formed by a suitable glass solder already used in known screen printing processes, however also can be flowing glass or conductive electrode materials in the case of application of electrode structures. All these materials 2a are designated in the following as "pastes" in the sense of the present invention.
  • Glass solder generally has a viscous consistency, which can be adjusted as needed. It is brought into the structures of the structuring surface 2 of the forming tool 1, as illustrated, by means of a process derived from printing engineering and then combined with the glass after first doctoring or rolling it into the tool structures, is combined with glass pressed on the flat glass 3 and is solidified based on the temperature of the heated flat glass, which then is about 450° C., i.e. by hardening by sintering.
  • the structures applied to the glass can also be made from viscous glass, which is produced by heating over its transition temperature.
  • An apparatus suitable for structuring glass and for application of glass is described hereinbelow.
  • the material to be melted, the paste 2a is optimally, provided in a suitable thickness, which corresponds to a required supply volume per unit surface area on the flat glass 3, so that the melted material is distributed in the structures of the forming tool 1 by suitable devices described herein later continuously synchronously with the "pressing speed" of the forming tool embodied as a roller.
  • pressing speed means the surface area covering speed of the forming tool 1.
  • the required glass thickness for formation of the crosspieces between the ducts or channels amounts to about 20 ⁇ m and 40 ⁇ m.
  • Flat glasses preferably ventilated glasses, so-called micro-sheets, which are produced with special manufacturing process (Down-draw), are used for this application and for comparable applications.
  • micro-sheets of this type also can comprise other meltable materials besides glass.
  • a micro-sheet made from glass is an unstructured and extremely bendable glass because of its reduced thickness, which is marketed as a roll material. Prior to the application it must be heated in the forming tool 1 over Tg, so that it is fluid, so that it can be pressed into the structuring recesses of the surface 2 of the forming tool 1, e.g. by means of a doctor blade or an (unshown) auxiliary roller.
  • the surface of the forming tool 1 be heated to a suitable process temperature for application, tempering and contacting, i.e. melting and hardening of the paste 2a.
  • a complete heating of the forming tool 1 is advantageously avoided so that appication of heat energy is locally strongly limited and is very efficiently applied, since only the structuring surface 2 of the forming tool 1 is heated to the predetermined required process temperature up to a surface depth predetermined by the height of the structures.
  • laser radiation is directed through the flat glass 3 to the structuring surface 2 of the forming tool 1 by means of a laser 5 for local heating of the structuring surface 2 to the process temperature prior to applying the tool 1 or during application of the tool 1, i.e. after applying the paste 2a, to the flat glass 3.
  • a laser 5 for local heating of the structuring surface 2 to the process temperature prior to applying the tool 1 or during application of the tool 1, i.e. after applying the paste 2a, to the flat glass 3.
  • an inductive or electrical resistance heating can be performed.
  • the paste material applied to the structuring recesses or cavities in the forming surface 2 can be heated from the outside to the required process temperature.
  • the laser 5 is chosen so that it produces laser radiation which has as high as possible a transmission through the flat glass, i.e. no noteworthy heating of the flat glass, and the structuring surface 2 can be heated to the required process temperature for hardening of the paste.
  • the glass can be heated already to a temperature at which the glass has a certain self-stability (i.e. under the transition temperature) by means of a suitable alternative energy source during contacting with the paste 2a and the energy required for keeping the micro-sheets melting or for sintering the applied glass solder is provided by the temperature of the laser-heated forming tool.
  • the structuring surface 2 of the tool filled with the paste Prior to contacting of the paste 2a with the surface of the flat glass 3, i.e. with the tool 1 lifted, the structuring surface 2 of the tool filled with the paste is pre-heated by an additional laser, so that for example the micro-sheet is heated to the suitable temperature for melting.
  • the radiation of this additional laser need not however pass through the glass, i.e. it can be in the UV or far IR region, since the flat glass 3 is not in the path of the laser radiation with the tool 1 in this position.
  • High power lasers for a wavelength range in which the laser radiation is transmitted through the glass are marketed and are economical.
  • the heating of the structuring surface 2 of the forming tool 1 can be completed by means of the laser 5 or by an inductive or electrical resistance heating, also other suitable conventional heat sources (flame strips or the like).
  • suitable conventional heat sources flame strips or the like.
  • the ability to exactly control the extent the heated locality and amount of the local heating is an advantage of the laser in comparison to the conventional energy sources.
  • a Nd-YAG laser (wavelength 1064 nm) and a high power diode laser (wavelength about 800 nm) are suitable as laser sources, since they have a high transmission through glass.
  • structural means for feeding the radiation to the tool 1 or its structuring surface are provided, which are known in the art.
  • the additional heating of the forming tool 1 by a conventional heat source, as described above, is especially advantageous during the starting stage.
  • the heating of the work tool 1 or its structuring surface 2 occurs at temperatures, which are below the temperature TK, at which the glass adheres to the tool.
  • the latter temperature depends on the material properties of the structuring surface of the tool and if necessary on the anti-adherency coating and also on the glass type. For example, chromium-nickel-steels, which are usable up to about 840K, because they are inclined to adhere at higher temperatures, adhere poorly to the glass. Platinum-gold alloys adhere still more poorly and are very expensive so that one must consider using a simpler material or that material only in a thin layer. In this case this material can be used anew after it wears away.
  • the structuring surface 2 of the forming tool 1 subjected to the wear is formed by a forming medium 7 with surface structures and openings for the paste 2a derived from the foils producing the print image in paper rotogravure.
  • This forming medium is releasably attached to a base tool 6.
  • This forming medium 7 can, as illustrated, be formed by different types of structures.
  • a thin structuring sheet 7 is provided, which has throughgoing openings 7b for the paste 2a conforming to the crosspieces to be formed.
  • Suitable structures 7c for positioning of the sheet 7 are provided on the surface of the base tool 6, as shown diagrammatically in FIG. 2. These structures are to be produced substantially simpler in the case of the flat display screen application than a structured one component tool for direct forming or shaping.
  • the thin sheet 7, which forms the structuring surface 2 can be thicker or equal to the thickness (height) of the structures produced; advantageously however thicker, thus the structures can be higher. If one produces a structure in the glass, which is higher than that desired, it can subsequently be ground to a very uniform height in a simple way.
  • the so-called cup in paper printing technology can be provided.
  • a material with a reduced thermal expansion and higher friction for example a special ceramic material, can be used for the base tool 6.
  • Other factors for example a minimal adherence to glass, higher wear resistance and higher temperature stability, as e.g. attained by the-above-mentioned chromium-nickel-steel or platinum-gold alloy, can be considered in the selection of the forming material 7.
  • the quarzal material has a reduced thermal conductivity. If then one uses a sufficiently thermal conductive material, e.g. a structured sheet according to FIG. 2, for the forming medium, then an outstanding local isolated heating to the predetermined surface depth is possible according to an advantageous embodiment of the two-component tool.
  • a sufficiently thermal conductive material e.g. a structured sheet according to FIG. 2, for the forming medium, then an outstanding local isolated heating to the predetermined surface depth is possible according to an advantageous embodiment of the two-component tool.
  • An additional advantage to the separation of the base tool 6 and the forming medium 7 is that the forming medium and the paste can be left on the glass after forming of the paste 2a and contacting with the glass 3, until it hardens. A substantially more rapid temperature change takes place in comparison to that obtained leaving a completely conventional tool on the glass structure because of the reduced heat capacity of the forming medium.
  • the sheet 7 subject to wear can be replaced, without changing the base tool.
  • Different rapid clamping or attaching devices which will be described hereinbelow can be used for that.
  • FIG. 3 shows a tool 1 formed as a roller 8 comprising a base tool 6 and forming medium 7, here a structured sheet as in FIG. 2, which is attached by means of a clamping device 9 to the base tool 6.
  • the roller 8 has a suitable structure 7c analogous to that shown in FIG. 2.
  • the rotation axis 10 of the roller 8 is horizontal and fixed in position.
  • the glass 3 passes under the roller 8 with a feed speed V, which rotates in the direction of the arrow and applies the desired structures as it rolls over the surface of the flat glass 3.
  • the roller 8 is controlled to move and press in a vertical direction.
  • the entire base tool 6 contacts the flat glass 3 with the forming medium 7 in the embodiment derived from rotogravure. An even contact of the forming medium 7 on the base tool 6 is guaranteed by a suitable clamping method taken from rotogravure.
  • roller axis 10 Different structural devices are available so that one skilled in the art can maintain the roller axis 10 so that it is movable only in the vertical direction as shown by the arrow.
  • the arrangement can be set forth so that the roller 8, which is pressed with the force F against the flat glass 3, rotates because of the motion of the flat glass 3 alone.
  • a drive for the roller axis 10 can be provided.
  • FIG. 3 shows a device with which an accumulated portion of the paste 2a, described in the following as a forward wave, located in a transition region between the doctor blade and the roller is pressed into the cavities or recesses, whereby a level surface is provided on the roller by the doctor blade 11.
  • This type of doctor blade is used in presses. It is desired to have no paste, i.e. to provide a smooth flush surface, except in the cavities in the press roller on its surface, which contact with the class.
  • FIG. 4 shows an embodiment similar to that of FIG. 3, in which instead of a doctor blade 11 a plane counter-roller 12 presses the forward wave of paste 2a into the cavities provided in the forming medium 7 to make a smooth flush surface.
  • FIG. 5 shows an embodiment similar to FIG. 3, in which however a melted micro-sheet thin glass 13 is pressed like a paste into the cavities of the forming medium instead of an already accumulated paste and a smooth surface is made on the roller by the doctor blade 11. This requires a preceding heating of the micro-sheets to a temperature above Tg.
  • FIG. 6 shows an embodiment according to FIG. 4, in which however, as shown in FIG. 5, a melted micro-sheet thin glass is pressed by means of an even surfaced counter-roller 12 into the structures of the forming medium 7.
  • the glass in the cavities is maintained in its softened or melted state by tempering the forming medium 7 by means of the laser 5 or a comparable heating source in all these embodiments, until a contact with the surface of the flat glass 3 occurs after additional rotation of the roller 8.
  • a contacting of the paste 2a (glass solder or melted micro-sheet) with the flat glass 3 occurs so that bonding of the paste 2a and the glass 3 can occur.
  • An additional possiblity for filling the structuring press or roller tool 8 with a paste 2a, as shown in FIG. 7, is to position the paste on the flat glass 3 immediately in front of the structuring roller 8, which is moved as a forward wave from the structuring roller.
  • the structures of the roller 8 are filled with the paste 2a by the compression force in the forward wave.
  • FIG. 8 is a variation of the embodiment of FIG. 7, in which the cavities of the structured roller 8 are filled by a melted thin glass as paste.
  • the enormous compression forces in the forward wave in front of the roller are to be considered as disadvantageous here.
  • the two-component structure of the forming tool however allows additional variations of the method and tool structure, which are described in the following FIGS. 9 to 13.
  • FIG. 9 shows a two-component tool structure according to FIG. 3, in which the cavities in the forming medium 7, especially according to the embodiments shown in FIGS. 3 to 8 are filled with paste.
  • the forming medium consisting of the sheet 7 is rolled off from the base tool 6 during the rolling of the structuring roller 8. After contacting the forming medium 7 with the surface of the flat glass 3 it remains on the flat glass 3. Because of that during the hardening of the paste (sintering process or cooling of the melted micro-sheets) a mechanical stabilization of the paste occurs, so that the forming medium prevents a running of the paste. After forming the cooled medium can be removed easily from the structures because of the greater thermal contraction relative to the solidified micro-sheet glass or contraction of the glass solder. A gentle conicity of the raised structure parts of the forming medium assists this release.
  • FIG. 10 An additional embodiment is shown in FIG. 10, in which the forming medium is a strip 7a of material wound like a coil on the roller-shaped base tool 6 and not, as in FIGS. 3 to 8 as an attached structuring sheet.
  • the embodiment of FIG. 10 is so-to-say a variation of that of FIG. 3.
  • the strip 7a of material beginning at one end of the base roller 6, is wound about the base roller 6 along a coil-like pre-structured peripheral member, which also acts for spacing the strip of material.
  • the paste to be applied is rubbed or brushed in the space between the individual layers of the strip according to the illustrated methods (doctoring or rolling on according to FIGS. 3 to 8), if necessary after pre-heating the micro-sheet glasses.
  • FIG. 11 An additional embodiment, in which the forming medium is not a suspended sheet, but is formed as a strip of as in the embodiment of FIG. 10, is shown in FIG. 11. While in the embodiment of FIG. 10 the strip of material is fixed on the roller 6 and this roller 6 with the strip 7a of material is rolled completely off over the surface of the glass 3, an embodiment shown in FIG. 11, in which similarly as in FIG. 9 the forming medium, the strip 7a of material, is left on the applied structures for a predetermined time interval.
  • the embodiment according to FIG. 11 provides two axial parallel rollers for this purpose, a forming base roller 6 and an auxiliary roller 14.
  • the forming base roller 6 has the strip of material to be supplied on one of its ends and is provided with closed rings for supplying the strip 7a of material perpendicular to the roller axis, which operate to space the strip of material.
  • the base roller 6 also operates for structuring the strip 7a of material to be positioned on the flat glass in order to leave it in the applied structures during the hardening of the paste.
  • a mechanical stabilization of the paste occurs, as in the embodiment of FIG. 9 (the forming medium prevents the running off of the paste), which is not desired in the conventional hot forming process.
  • the forming strip 7a of medium is removed by means of the auxiliary roller 14 axially parallel to the base roller after hardening of the applied paste and melting with the flat glass 3 by the laser 5.
  • This auxiliary roller is preferably not structured to be able to compensate or balance an eventual temperature and thus length variation of the base roller 6.
  • the removal of the strip of material takes place according to the indicated arrow at the one end of the auxiliary roller. It is also possible to accomplish several strip supply and removals.
  • the lateral guiding of the strip 7a at the rear of the auxiliary roller 14 occurs by moving the glass 3 since the paste applied after the structuring solidifies very rapidly and the strip 7a is laterally fixed until being removed from the auxiliary roller 14.
  • the width of the strip 7a forming the structure amounts to about 150 to 750 ⁇ m less the crosspiece width of 50 ⁇ m to 100 ⁇ m, preferably 200 to 600 ⁇ m. It is possible to use strips with a width of less than 150 ⁇ m, however the breaking or tear strength of the strip is always less.
  • the spacing of the strips from each other, predetermined by the guide rings on the base roller 6, should amount to about 50 to 100 ⁇ m, but preferably is as small as possible.
  • the heating of the strip 7a of material occurs advantageously by means of laser radiation, whereby, as already mentioned, an inductive or electrical resistance heating can also be used.
  • a base roller 6 made from Quarzal must be tempered with a tolerance of about ⁇ 40° C. for a display width of about 360 mm for a 25" PALC display screen, so that no additional expansion occurs which would prevent the desired accuracy of ⁇ 10 ⁇ m.
  • the embodiment with the strip of material according to FIG. 11 corresponds substantially the structure of the known wafer saw.
  • the spacing between the rollers 6 and 14 depends on the feed speed, in which the strip 7a of material remains for a few seconds to minutes in the applied paste structure until this structure hardens.
  • the strip 7a of material is loosened by thermal expansion by heating on the base roller 6, it is advantageous according to the embodiment of FIG. 11A, to provide a third non-structured roller 15 axially parallel to it, by which the strip of material is tightened or put under tension.
  • the strip of material is contacted by a base roller over a small angular range. Suitable structures are available for one skilled in the art to form the arrangement according to FIGS. 11A.
  • FIG. 12 shows an embodiment of FIG. 11 with a suitable laser radiation heating on the contacting surface of the forming medium with the flat glass 3.
  • An array of several diode lasers arranged side-by-side acts as a laser source 5. This laser array produces a homogeneous radiation profile on the width of the base roller 6 parallel to the roller axis.
  • the flat glass 3 is guided over conveying rollers 16 and also at one end over a slide foot piece 4 which act to provide a counter-force to the pressing force F.
  • the laser array is located next to the slide foot piece 4 under the flat glass 3 and directs the laser radiation to the forming medium 7a.
  • a suitable laser with a wavelength of 800 nm is for example obtainable commercially with a power of 800 watt at 0.5 m array length. Typically about 30% of the total input power is dissipated as heat, so this produces about 240 watts of heat energy.
  • the forming medium can be heated in a time interval of about one minute to 100K using steel in the forming medium with a thickness of 200 nm by means of a laser of 800 watt for a typical flat screen display glass of 360 ⁇ 650 mm.
  • the laser power can be multiplied many times by providing several laser diode arrays.
  • the laser source 5 can also be used at other locations (in front of or behind the contacting surface with the glass) for heating the forming medium and the forming paste besides the later radiation heating of the contacting surface of the forming medium 7, 7a with the glass 3. Since during heating prior to the contacting (e.g. for heating the micro-sheets), the laser radiation must not pass through the glass 3, however also laser sources can be used whose radiation has a high absorption in the glass (such as e.g. CO 2 radiation).
  • FIG. 13 shows this type of arrangement in which the laser diode array 17 is arranged laterally to the base roller.
  • This lateral laser diode array can also be provided in other embodiments than the above-described embodiment, especially a laser combination according to FIGS. 12 and 13 is possible.
  • a "paste-like material” is a material which has the flow or viscosity properties of a paste.
  • German Patent Application 197 13 311.8-45 of Mar. 29, 1997 is incorporated here by reference.
  • This German Patent Application describes the invention described hereinabove and claimed in the claims appended hereinbelow and provides the basis for a claim of priority for the instant invention under 35 U.S.C. 119.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Surface Treatment Of Glass (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Laminated Bodies (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
US09/048,624 1997-03-29 1998-03-26 Method and apparatus for making large-scale precision structures in flat glass Expired - Fee Related US5948130A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19713311A DE19713311C2 (de) 1997-03-29 1997-03-29 Verfahren und Vorrichtung zur Erzeugung von großflächigen Präzisionsstrukturen auf Flachglas
DE19713311 1997-03-29

Publications (1)

Publication Number Publication Date
US5948130A true US5948130A (en) 1999-09-07

Family

ID=7825059

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/048,624 Expired - Fee Related US5948130A (en) 1997-03-29 1998-03-26 Method and apparatus for making large-scale precision structures in flat glass

Country Status (9)

Country Link
US (1) US5948130A (de)
EP (1) EP0867418B1 (de)
JP (1) JPH1111964A (de)
KR (1) KR19980080775A (de)
CN (1) CN1199025A (de)
AT (1) ATE203497T1 (de)
DE (2) DE19713311C2 (de)
MY (1) MY134093A (de)
TW (1) TW419443B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6193144B1 (en) * 1997-07-23 2001-02-27 Hitachi, Ltd. Paste providing method, soldering method and apparatus and system therefor
US6477863B1 (en) * 1997-06-10 2002-11-12 Thomson Multimedia Method for producing a dielectric coating comprising embossed patterns on a plasma panel faceplate
CN110911331A (zh) * 2018-09-14 2020-03-24 东莞市中麒光电技术有限公司 一种转移并便于led芯片固定的吸嘴及单颗led芯片转移、固定于背板的方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10026976C2 (de) * 2000-05-31 2002-08-01 Schott Glas Kanalplatte aus Glas für Flachbildschirme und Verfahren zu ihrer Herstellung
CN101061073A (zh) 2004-09-30 2007-10-24 贝克顿·迪金森公司 减少或消除玻璃容器中残余物的方法以及根据该方法制成的玻璃容器
DE102004056492B3 (de) * 2004-11-23 2006-08-10 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zum strukturierten Aufbringen einer thermoplastischen Paste auf ein Substrat und dessen Verwendung

Citations (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE111216C (de) *
US528240A (en) * 1894-10-30 sievert
US669381A (en) * 1900-09-27 1901-03-05 William Buttler Method of applying backing material to glass sheets or plates.
US789191A (en) * 1904-01-20 1905-05-09 Pressed Prism Plate Glass Co Manufacture of glass.
US798643A (en) * 1903-06-16 1905-09-05 Frank L O Wadsworth Manufacture of glass sheets.
US798644A (en) * 1903-09-29 1905-09-05 Frank L O Wadsworth Manufacture of sheets of glass.
US798645A (en) * 1903-10-01 1905-09-05 Frank L O Wadsworth Manufacture of sheets of glass.
US818210A (en) * 1905-08-16 1906-04-17 Pressed Prism Plate Glass Co Apparatus for the manufacture of glass sheets.
US907656A (en) * 1908-12-22 Pressed Prism Plate Glass Co Apparatus for the manufacture of sheets of glass.
US1028128A (en) * 1901-12-20 1912-06-04 Robert C Mitchell Power-transmission mechanism.
US1261939A (en) * 1917-12-05 1918-04-09 Emil G Johanson Glass-molding apparatus.
US1297566A (en) * 1917-07-26 1919-03-18 Emil G Johanson Glass-molding apparatus.
FR904468A (fr) * 1943-04-06 1945-11-07 Berliner Quarz Schmelze Gmbh Procédé de fabrication de plaques minces, glacées sur les deux faces, en matière quartzeuse (quartz fondu) et en verre de quartz
US3369883A (en) * 1964-10-27 1968-02-20 Corning Glass Works Method of softening glass for punching holes therein by heating with a high frequency pulse current
US3607180A (en) * 1968-06-25 1971-09-21 Tektronix Inc Bonding with a glass frit coating applied by a knurled roller
GB2066159A (en) * 1979-12-03 1981-07-08 Dainippon Screen Mfg An intaglio printing plate and a printing method
DE3225483A1 (de) * 1981-11-17 1983-05-26 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zur herstellung elektrisch leitfaehiger bereiche
GB2110162A (en) * 1981-11-17 1983-06-15 Bosch Gmbh Robert A method of producing electrically conductive areas
US5009689A (en) * 1986-01-30 1991-04-23 U.S. Philips Corporation Method of manufacturing a semiconductor device
JPH03254857A (ja) * 1990-03-02 1991-11-13 Dainippon Printing Co Ltd 厚膜パターン形成方法
US5484467A (en) * 1992-08-14 1996-01-16 Schott Glaswerke Process for the production of decorative glass ceramic articles
JPH08273537A (ja) * 1995-03-30 1996-10-18 Dainippon Printing Co Ltd プラズマディスプレイパネルのセル障壁製造方法
JPH0912336A (ja) * 1995-06-26 1997-01-14 Asahi Glass Co Ltd 基板上への隔壁形成方法
FR2738393A1 (fr) * 1995-09-06 1997-03-07 Kyocera Corp Substrat d'affichage a plasma et procede pour sa fabrication
EP0802170A2 (de) * 1996-04-16 1997-10-22 Corning Incorporated Verfahren und Apparat zum Herstellen von Glasrippenstrukturen

Patent Citations (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE111216C (de) *
US528240A (en) * 1894-10-30 sievert
US907656A (en) * 1908-12-22 Pressed Prism Plate Glass Co Apparatus for the manufacture of sheets of glass.
US669381A (en) * 1900-09-27 1901-03-05 William Buttler Method of applying backing material to glass sheets or plates.
US1028128A (en) * 1901-12-20 1912-06-04 Robert C Mitchell Power-transmission mechanism.
US798643A (en) * 1903-06-16 1905-09-05 Frank L O Wadsworth Manufacture of glass sheets.
US798644A (en) * 1903-09-29 1905-09-05 Frank L O Wadsworth Manufacture of sheets of glass.
US798645A (en) * 1903-10-01 1905-09-05 Frank L O Wadsworth Manufacture of sheets of glass.
US789191A (en) * 1904-01-20 1905-05-09 Pressed Prism Plate Glass Co Manufacture of glass.
US818210A (en) * 1905-08-16 1906-04-17 Pressed Prism Plate Glass Co Apparatus for the manufacture of glass sheets.
US1297566A (en) * 1917-07-26 1919-03-18 Emil G Johanson Glass-molding apparatus.
US1261939A (en) * 1917-12-05 1918-04-09 Emil G Johanson Glass-molding apparatus.
FR904468A (fr) * 1943-04-06 1945-11-07 Berliner Quarz Schmelze Gmbh Procédé de fabrication de plaques minces, glacées sur les deux faces, en matière quartzeuse (quartz fondu) et en verre de quartz
US3369883A (en) * 1964-10-27 1968-02-20 Corning Glass Works Method of softening glass for punching holes therein by heating with a high frequency pulse current
US3607180A (en) * 1968-06-25 1971-09-21 Tektronix Inc Bonding with a glass frit coating applied by a knurled roller
GB2066159A (en) * 1979-12-03 1981-07-08 Dainippon Screen Mfg An intaglio printing plate and a printing method
DE3225483A1 (de) * 1981-11-17 1983-05-26 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zur herstellung elektrisch leitfaehiger bereiche
GB2110162A (en) * 1981-11-17 1983-06-15 Bosch Gmbh Robert A method of producing electrically conductive areas
US5009689A (en) * 1986-01-30 1991-04-23 U.S. Philips Corporation Method of manufacturing a semiconductor device
JPH03254857A (ja) * 1990-03-02 1991-11-13 Dainippon Printing Co Ltd 厚膜パターン形成方法
US5484467A (en) * 1992-08-14 1996-01-16 Schott Glaswerke Process for the production of decorative glass ceramic articles
JPH08273537A (ja) * 1995-03-30 1996-10-18 Dainippon Printing Co Ltd プラズマディスプレイパネルのセル障壁製造方法
JPH0912336A (ja) * 1995-06-26 1997-01-14 Asahi Glass Co Ltd 基板上への隔壁形成方法
FR2738393A1 (fr) * 1995-09-06 1997-03-07 Kyocera Corp Substrat d'affichage a plasma et procede pour sa fabrication
EP0802170A2 (de) * 1996-04-16 1997-10-22 Corning Incorporated Verfahren und Apparat zum Herstellen von Glasrippenstrukturen

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6477863B1 (en) * 1997-06-10 2002-11-12 Thomson Multimedia Method for producing a dielectric coating comprising embossed patterns on a plasma panel faceplate
US6193144B1 (en) * 1997-07-23 2001-02-27 Hitachi, Ltd. Paste providing method, soldering method and apparatus and system therefor
US6533162B2 (en) 1997-07-23 2003-03-18 Hitachi, Ltd. Paste providing method, soldering method and apparatus and system therefor
US20030057264A1 (en) * 1997-07-23 2003-03-27 Fumio Yoshikawa Paste providing method, soldering method and apparatus and system therefor
US6705505B2 (en) 1997-07-23 2004-03-16 Hitachi, Ltd. Paste providing method, soldering method and apparatus and system therefor
CN110911331A (zh) * 2018-09-14 2020-03-24 东莞市中麒光电技术有限公司 一种转移并便于led芯片固定的吸嘴及单颗led芯片转移、固定于背板的方法

Also Published As

Publication number Publication date
JPH1111964A (ja) 1999-01-19
MY134093A (en) 2007-11-30
CN1199025A (zh) 1998-11-18
EP0867418A1 (de) 1998-09-30
KR19980080775A (ko) 1998-11-25
ATE203497T1 (de) 2001-08-15
TW419443B (en) 2001-01-21
DE59801063D1 (de) 2001-08-30
EP0867418B1 (de) 2001-07-25
DE19713311A1 (de) 1998-10-01
DE19713311C2 (de) 1999-03-11

Similar Documents

Publication Publication Date Title
US5987923A (en) Process and apparatus for hot forming precision structures in flat glass
JP2725214B2 (ja) 発光ダイオード行を作るための組立方法
US5948130A (en) Method and apparatus for making large-scale precision structures in flat glass
EP0837486A2 (de) Gasentladungs-Anzeigetafel, Herstellungsverfahren solcher Anzeigetafeln und seine Verwendung in eine Anzeigevorrichtung
KR930017828A (ko) 광섬유 리본의 제조 시스템 및 방법
EP3857278A1 (de) Integrierte heizstrukturen in einer photonischen integrierten schaltung für lötbefestigungsanwendungen
CN108672849A (zh) 微束电弧选择性熔凝与电火花分层铣削复合增材制造方法
US6128925A (en) Forming tool for structuring flat material, especially plate glass
CN102431312A (zh) 热头、热敏打印机及热头的制造方法
DE10318909A1 (de) Verfahren zum Bedrucken einer Oberfläche
HK1016958A (en) Method and apparatus for making large-scale precision structures in flat glass
CN111361149B (zh) 一种均热防断层选择性激光烧结装置及其制造方法
KR101076313B1 (ko) 평판 디스플레이 장치용 도광판 제조 방법
HK1017336A (en) Process and apparatus for hot forming precision structures in flat glass
US7690913B2 (en) Embossing apparatus and method
EP2078603A1 (de) Verfahren zur Herstellung eines strukturierten Harzbogens
JP2009530655A (ja) チャネル導波路構造を有する光学装置、及びその作製方法
JPH1031958A (ja) プラズマディスプレイパネルの障壁形成方法
KR101064492B1 (ko) 열 가변형 핫 엠보싱 장치
EP3284325B1 (de) Vorrichtung und verfahren zur herstellung von leiterplatten für elektrische und/oder elektronische schaltungen
HK1017636A (en) Forming tool for structuring flat material
JPH03187783A (ja) 熱転写記録方法
JPH01167789A (ja) 表示用パネル
JP2017197403A (ja) ガラス基板生成装置

Legal Events

Date Code Title Description
FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20030907